I got this leftover shampoo from my not-yet-concluded quest of “searching the perfect shampoo” (for now, “the chosen one” is Unilever’s Sunsilk Clean and Lively) and I was wondering what can I do with the leftover shampoo then I found these two links:
I tried the cleaning-the-toilet one, and the shampoo actually did a good job — it’s a cleaner, after all.